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3 years ago

4x + 1 = 2x – 5 . Can someone help me please. Whoever gets it right gets the brainliest.

Mathematics

2 answers:

natta225 [31]3 years ago

7 0

$\tt}Hey!$

Look at attached image! If you need to see it straight, please rotate image.

Hope this helps!☺

frutty [35]3 years ago

6 0

Answer:

your answer to this is gonna be x= -3

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The sum of two numbers is 19 and there difference is 7 what are the two numbers

Zielflug [23.3K]

Answer:

The two numbers are 13 and 6.

Step-by-step explanation:

x+y=19

x-y=7

-----------

2x=26

x=26/2

x=13

13+y=19

y=19-13

y=6

x=13, y=6.

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3 years ago

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2+17+8 rewritten correctly using the commutative property and then simplified correctly

zheka24 [161]

Answer:

Step-by-step explanation:

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3 years ago

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Megan is planting a garden with two beds with her mother and father. Megan can plant 1 garden bed in 8 hours. Her mother can pla

olganol [36]

Answer:

$1.5\text{ hours}$

Step-by-step explanation:

We know that Megan can plant 1 garden bed in 8 hours. Let M represent Megan's rate. So:

$M=\frac{1\text{ b}}{8\text{ hr}}$

We know that her mother can plant 2 garden beds in that time (8 hours). Let A represent the mother's rate. So:

$A=\frac{2\text{ b}}{8\text{ hr}}=\frac{1\text{ b}}{\text{ 4hr}}$

We can reduce this to 1 flower bed every 4 hours.

We also know that Megan's father can plant 1 1/3 or 4/3 garden beds in 8 hours. Let D represent the father's rate. So:

$D=\frac{4/3 \text{ hr}}{8 \text{ hr}}=\frac{1\text{ b}}{6\text{ hr}}$

We can reduce (4/3)/8 to 1/6.

We know that the three began working together. They worked together for 3 hours. So, after 3 hours, the amount of beds they planted all together is 3 hours times their respective rates. So, we can write the following expression:

$3(\frac{1}{8}+\frac{1}{4}+\frac{1}{6})$

We know that at this point, Megan's father left, leaving only Megan and her mother. We know that they worked together for another 30 minutes, or 1/2 of an hour. So, after this, they will have planted:

$3(\frac{1}{8}+\frac{1}{4}+\frac{1}{6})+\frac{1}{2}(\frac{1}{8}+\frac{1}{4})$

Garden beds.

Now, Megan's mother leaves, leaving only Megan. Let's let x represent the number of hours. So, we can write the last part of our expression:

$3(\frac{1}{8}+\frac{1}{4}+\frac{1}{6})+\frac{1}{2}(\frac{1}{8}+\frac{1}{4})+x(\frac{1}{8})$

We know that in the end, they planted 2 flower beds. So, our entire expression equals 2:

$3(\frac{1}{8}+\frac{1}{4}+\frac{1}{6})+\frac{1}{2}(\frac{1}{8}+\frac{1}{4})+x(\frac{1}{8})=2$

To find out how long it took Megan, we will solve for x.

Let's do each term individually:

First Term:

We have:

$3(\frac{1}{8}+\frac{1}{4}+\frac{1}{6})$

Make the fractions with common denominators. Our common denominator here is 24. So:

$3(\frac{3}{24}+\frac{6}{24}+\frac{4}{24})$

Add:

$=3(\frac{13}{24})$

Multiply. So, our first term is:

$=\frac{39}{24}$

Second Term:

We have:

$\frac{1}{2}(\frac{1}{8}+\frac{1}{4})$

Again, let's turn the fractions into fractions with common denominators so we can add them. The common denominator here is 8. So:

$\frac{1}{2}(\frac{1}{8}+\frac{2}{8})$

Add:

$=\frac{1}{2}(\frac{3}{8})$

Multiply:

$=\frac{3}{16}$

So, our equation is now:

$\frac{39}{24}+\frac{3}{16}+\frac{1}{8}x=2$

Add on the left. Use the common denominator of 48. So:

$\frac{78}{48}+\frac{9}{48}+\frac{1}{8}x=2$

Add:

$\frac{87}{48}+\frac{1}{8}x=2$

Subtract 87/48 from both sides:

$\frac{1}{8}x=2-\frac{87}{48}$

Let turn into a fraction with a denominator of 48. So:

$\frac{1}{8}x=\frac{96}{48}-\frac{87}{48}$

Subtract:

$\frac{1}{8}x=\frac{9}{48}$

Reduce the right using 3:

$\frac{1}{8}x=\frac{3}{16}$

Multiply both sides by 8:

$x=\frac{24}{16}$

Reduce using 8. So, the time it will take Megan to finish planting the garden beds by herself is:

$x=3/2=1.5\text{ hours}$

And we're done!

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3 years ago

The mean of the scores obtained by a class of students on a physics test is 42. The standard deviation is 8%. Students have to s

NemiM [27]

The correct answer is:
16%.

Explanation: 
We use a z-score to answer this question.
The formula for a z-score is:
z= $\frac{x-mue}{sigma}$ ,
where mue is the mean and sigma is the standard deviation.

Using our information, we have:
z= $\frac{50-42}{8} = \frac{8}{8} = 1$ .

Using a z-table, we see that the area to the left of, or less than, this score is 0.8413. We want to know how many students scored more than this, so we subtract from 1:
1-0.8413=0.1587, which rounds to 16%.

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3 years ago

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What is 8(9h - 6) simplifyed

wariber [46]

Answer:

72h - 48

Step-by-step explanation:

Use distributive property

8(9h - 6)

Multiply 8 out of 9h - 6

72h - 48

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3 years ago